Which situation is NOT covered by a watercraft endorsement under a homeowners policy?

The situation where a friend rents the boat and runs it into a neighbor's dock is not covered by a watercraft endorsement under a homeowners policy due to the nature of the liability involved. Homeowners policies with watercraft endorsements typically extend coverage to personal use and specific incidents involving the insured's property or family members. However, when a boat is rented out, it generally falls under a separate commercial use category, which is not included in a standard homeowners policy.

In contrast, the other situations reflect personal liability or accidents that occur while the insured or their family members are using the boat. Injuries to family members or accidents involving the insured's direct use of the boat are typically covered, as they relate to personal liability. The distinction is crucial because homeowners policies are designed to protect against personal liabilities, while incidents involving rental arrangements typically require more specialized insurance coverage that addresses commercial liabilities.